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React.useEffect(() => {
  return auth().onAuthStateChanged((user) => {
    if (user) {
      setUser(user);
    } else {
      setUser(null);
    }
  });
}, []);

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try {
  await auth().signInWithPopup(provider);
  const user = await auth().currentUser;
  setUser(user);
} catch(e) {}

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import React from 'react';
import { auth } from './firebase';

function Login() {
  const login = async () => {
    const provider = new auth.GoogleAuthProvider();
    try {
      await auth().signInWithPopup(provider);
    } catch (e) {}
  };

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"emulators": "firebase emulators:start --import=data --export-on-exit",

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// src/App.js

import React from 'react';
import { db } from './firebase';

function App() {
  const [data, setData] = React.useState();
  React.useEffect(() => {
    db.doc('people/me')
      .get()

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// src/App.js
import React from "react";
import { db } from "./firebase";

function App() {
  db.doc("hello/world").set({ hello: "world" });
  return <div />;
}

export default App;

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// src/firebase.js

import firebase from 'firebase/app';
import 'firebase/auth';
import 'firebase/firestore';

// TODO: Use a configuration object
firebaseApp.initializeApp({
  projectId: '',
  appId: '',

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$ yarn add firebase

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firebase-debug.log*
firestore-debug.log*
ui-debug.log*

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language: objective-c
osx_image: xcode7.3
before_script:
  - openssl aes-256-cbc -k $ENCRYPTION_PASSWORD -in fastlane/Certificates/distribution.p12.enc
-d -a -out fastlane/Certificates/distribution.p12
script:
  - "./fastlane/travis.sh"